Construction will start in the next few weeks on an urban style mixed-use development in Dallas' popular Deep Ellum district.The one-block project by North Carolina-based Crescent Communities will replace a strip of old industrial buildings at Canton Street and Malcolm X Boulevard just east of downtown.The 7-story development will bring apartments and streetfront retail to an area that's seeing widespread new development."Canton Street carries a lot of traffic," said Michael Blackwell, Crescent Communities' regional development manager. "Our idea is to put a food and beverage outlet on the corner.